Process B.V.

Dust Collection & Gas Scrubbing

2

Dust Collection & Gas Scrubbing

TEMA Process B.V. offers Dust Collection & Gas

Scrubbing equipment and systems for emission

control, gas cleaning and product recovery.

TEMA Process designs the Dust Collection & Gas

Scrubbing equipment and systems in accordance

to the latest standards, local conditions and product

specifications.

Tema Process Dust Collection & Gas Scrubbing Line

include:

Jet bag Filters

Cyclones

Venturi Scrubbers

Packed Tower Scrubbers

Dry Scrubbers

Cyclones in combination with Jet bag Filters

Cyclones in combination with Packed Tower

Scrubbers

Figure 1.0 shows the Efficiency / Particle size relationship of above mentioned line of equipment.

Figure 1.0

Jet bag Filter under construction

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Jet bag Filters

Design of Jet bag Filters (Process Technical)

TEMA Process design for continuous Jet bag Filters

is based on the process data and local conditions

and can be offered “Taylor-made” suitable for the

application.

Important criteria for the design are:

Gas volume in Nm³/h

Chemical composition of the gases

Moisture content of the gases

Temperature of the gases

Dust in kg/h

Characteristics of the dust,

like corrosive, abrasive etc.

Particle size range of the dust

Local emission standards

Explosion resistant (ATEX)

Hygienic design

On line or off line systems

Materials of construction

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Design of Jet bag Filters (Construction & Layout)

Based on process technical data the filter area is

determined and the construction of the Jet bag

Filter, suitable for the project, can be designed in

The filter top part can be designed based on following variables:

Number of covers

Layout of the covers

The covers can be located on one side

or 2 sides of the air buffer tanks

Under each cover there are 4 rows in width

and 8 – 16 filter bags in depth

Materials of construction can be selected

in accordance to the table of “construction

materials” (page nr. 8)

Jet bag Filter Top part ( partly open)

detail supported by special parametric software as

partly shown below:

Filter 3-3-16 Parameters

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Design of Jet bag Filters (Construction & Layout))

The bags are protected by standard wear

protection shields. ( see page 6) The maximum number of covers on one side

of the buffer tanks are 4 (maximum 4 covers

on each side!)

Top view of Filter top part without covers

Top part with covers

The top part is standard made of stainless steel

and is isolated.

The top part can be provided with double covers

(see construction detail on page 6).

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Design of Jet bag Filters (Construction & Layout)

Length of filter bags are available

from 2000 mm – 5000 mm Bag support cages can be split in length in

several parts for one filter bag with easy

connection to reduce space for replacement

of the filter material (see page nr. 8) The textile bags can be supplied in different

qualities according to table figure 2.0 (page nr. 7) The filter housing is designed in several “modules”

Inside view top-part of Bag Filter, bags, support cages & wear protection shields

Wear protectionof Filter Bags

Double cover, isolated

The dust is collected in a tapered chute with

an integrated spiral screw for dust discharge The location of the screw discharge also can

be chosen to meet local dust collection

or transport The 3D design drawing is the base for laser

cutting- and production drawings An enormous number of construction variations

are possible considering the variables in number

of covers, number of bags in the length rows

and filter bags length

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Design of Jet bag Filters (Filter bags)

Bottom view from Filter bags

Filter bag for most demanding solutions like: High temperatures Micro dust particles

Fiber

Recomendedcontinuousoperation

Temperature(Dry Heat)

WaterVapor

SaturedCondition

(Moist Heat)

Max.(short time)Operation

TemperatureDry heat

SupportsCombustion

RESISTANCE TO

AlkalinesMineralAcids

OrganicAcids

OxidizingAgents

OrganicSolvents

PP94° C

200° F94° C

200° F107° C225° F

Yes 5 5 5 3 5

PES132° C270° F

94° C200° F

150° C300° F

Yes 2 2 2 3 3

PAN125° C260° F

125° C260° F

150° C300° F

Yes 2 4 5 3 4

ARAMIDNOMEX®

204° C400° F

177° C350° F

240° C465° F

No 3 2 2 1 4

PTFE260° C500° F

260° C500° F

290° C550° F

No 5 5 5 5 5

PPS190° C375° F

190° C375° F

232° C450° F

No 5 5 5 2 5

POLYIMIDEP84®

260° C500° F

195° c383° F

300° C580° F

No 2 4 4 4 5

FIBER GLASS260° C500° F

260° C500° F

290° C550° F

No 2 4 4 5 4

Legend: 1 - Poor; 2 - Fair; 3 - Good; 4 - Very Good; 5 - ExcelentNOMEX® is registed Trademark of E.I. DU PONT DE NEMOURS

P84® is registered Trademark of LENZING A.G.Figure 2.0

Chemical unfriendly environment Electrostatic dust particles

Properties of Textile Fibers for Dry Filtration

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Design of Jet bag Filters (Details of construction)

Support cage in filter bag How to install a filter bag

Top of support cage1/1 steel wiresupport cage

½ steel wiresupport cage

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Design of Jet bag Filters (Details of construction)

Duplex steel

Stainless steel AISI 304(L),

316(L), 904L, 254 SMO

Titanium

Dust discharge spiral screw

Assembly of Filter Top part

Mild steel

Heat resistant steel 16Mo 3

Heat resistant stainless steel

153 MA, AISI 321, 1.4878

Materials of construction

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Cyclones

A Cyclone is a relative simple device that uses

centrifugal force to separate larger particles from

air streams.

It is a high capacity / high efficiency separator ( figure

3.0) that also can be used in combination with fluid

bed Dryers / Coolers, Jet bag Filters, Packed Tower

Scrubbers and other process equipment.

Diameters from 400 to 2000 mm.

Materials of construction

Mild steel

Heat resistant steel 16Mo 3

Heat resistant stainless steel

153 MA, AISI 321, 1.4878

Duplex steel

Stainless steel AISI 304(L),

316(L), 904L, 254 SMO

Titanium

Wear resistant design

Figure 3.0

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High capacity

Cyclones

High efficiency

Cyclones

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Venturi Scrubber

Venturi scrubbers are used to remove particulate

matter from a gas stream. A „Venturi Scrubber“

consist of a contact section called a venturi section

in combination with a droplet separator section.

Exhaust gas with dust is fed into the venturi section

where it passes through a water mist at the venturi

throat at high velocity. This results in thorough

mixing of water droplets and dust particles which

agglomerate to form larger particles which are

subsequently removed from the gas in the separator

section.

The water supply units and spraying systems allow

recirculation of water with high dust contents. These

systems are used for cleaning particulate matter

from exhaust gas with stringent emission level,

soluble dust mainly in the mineral and chemical

industry.

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Packed Tower Scrubber

Packed tower scrubbers are used to remove

particulate and / or vapor contaminants from an

exhaust gas stream by way of dilution or absorption.

A packed tower is an efficient method of carrying

out mass transfer between gas and liquid phases.

Packed tower scrubbers incorporate packing media

to facilitate intimate contact between a scrubbing

liquid and gas to be scrubbed.

Applications are: reduction of dust or gaseous

emission levels, product recovery, air pollution and

odor control.

In countercurrent scrubber operation, the gas

flows upward through the packing material, while

the liquid flows downward by gravity through the

packing material. The liquid wets the surfaces of the

packing material, providing a large amount of surface

area for diffusion of one or more components of the

gas stream into the liquid stream, thereby cleaning

the gas.

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Adsorption of acidic gases and organic compounds

occurs in the reaction ducting and in the dust cake

on the fabric filter bags.

The unused and recycled adsorbent (Ca(OH)2),

sodium bicarbonate, activated carbon) are injected

into a „reacting“ duct and then dispersed over the

complete filter area.

The final emission levels on HF, HCL, SOx and organics

is depending on the used adsorbent, stoichiometric

value and operating temperatures.

For smaller systems the adsorbent is premilled

and supplied in Big-Bags on larger systems on site

milling and silo-storage can be used.

Dry Gas Scrubbing

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Double Jet bag Filter

Fluid bed Deduster

Special Applications

Process B.V.

Europaweg 5b

8181 BG Heerde The Netherlands

postal address

P.O. Box 19

8180 AA Heerde The Netherlands W B 9 0 6 / 0 5 . 2 0 1 2

T +31 (0) 57 857 86 50

F +31 (0) 57 857 86 69

www.temaprocess.com

sales@temaprocess.com